Motorized Lead Screws - Fortive ICG
Transcript of Motorized Lead Screws - Fortive ICG
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Motorized Lead ScrewsStepper Motor Linear Actuator
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Motorized Lead Screws Precision engineered to be compact, powerful, quiet and efficient New Motorized Lead Screws from Thomson combine a hybrid stepper motor and a precision lead screw together in one compact envelope. Patent-pending Taper-Lock technology allows quick decoupling and secure, properly aligned connections. This combination offers several advantages over a traditional solution.
Increased Torque Density Thomson Motorized Lead Screws offer increased torque density over alternative solutions. By optimizing the motor performance and matching this with the ideal lead screw and nut design, Thomson has been able to increase the load capacity by up to 30% while maintaining the same motor footprint.
Improved Efficiency Thomson provides a more efficient solution to reduce power consumption, improve operating battery life, and decrease motor footprint. With this improved efficiency, an increase in system load performance or a reduction in power consumption can be expected – all while having a lower cost of ownership.
The Taper-Lock Advantage The patent-pending Taper-Lock design provides the ability to quickly decouple the lead screw from the stepper motor. The connection is secure, robust, and self-aligning.
Reduced Noise Thomson can optimize your motor configuration and windings to limit motor harmonics and reduce motor noise at your application operating points.
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Technology Overview Thomson Motorized Lead Screws come in two basic configurations – rotating screw (S) and rotating nut (N). Rotating screw assemblies actuate by having the motor rotate a lead screw and translate a load that is attached to the lead nut. Rotating nut assemblies actuate by rotating a nut within the motor body. Motion is achieved by constraining the motor and translating a load attached to the lead screw or constraining the lead screw and translating a load attached to the motor.
Rotating Screw Configuration (S) The rotating screw design features our patent-pending Taper-Lock design to connect the lead screw to the motor shaft. This design allows for rapid prototyping, field serviceability and reduced inventory. Ideally suited for applications where high levels of maintenance are anticipated, frequent disassembly/reassembly is required or where easy removal of the lead screw is necessary.
Rotating Nut Configuration (N) The rotating nut design features our patent-pending integration of a lead nut into the motor rotor to maximize screw diameter which increases load capacity. Ideally suited for applications where no visible rotation is desired or where it is necessary to translate a load on either side of the motor.
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Thomson Advantage
The curves where generated with a 1.5 A / 2.33 V, 1.8° NEMA 17 single stack, rotating screw stepper motor. Test ran with a 0.9°, 24 VDC chopper drive and a 4-2516 lead screw at an ambient temperature of 20 °C.
Temperature Rise ComparisonThomson offers more efficient motors where more torque can be output with less heat loss – meaning that our motors can be operated with higher power input while maintaining lower heat generation.
Thrust Force ComparisonThomson optimized motors will result in up to a 30% increase in thrust over the competition. That means you will get a smaller and more efficient solution with the same power output.
The Thomson Taper-Lock Fixing the motor to the lead screw usually requires a coupling assembly (A), a counter-bore press fit (B) or a hollow shaft press fit (C). The assembly process may also entail the use of adhesives or welding, but the bottom line is that all these solutions make it difficult or impossible to change lead screws or perform maintenance. Thomson has solved this issue with our patent-pending Taper-Lock coupling (D) that requires only a single retention fastener.
Load
[lbs
]
Load
[N]
Linear speed [in/s (mm/s)] Operation time [h]
Thomson ThomsonCompetitor Competitor
Mot
or h
ousi
ng te
mpe
ratu
re [°
C]
Mot
or h
ousi
ng te
mpe
ratu
re [°
F]
A B C D
Load vs. Speed Temperature vs. Operation Time
Thomson Taper-Lock • high accuracy• requires no extra space • easy to replace quickly • easy assembly and alignment
Hollow shaft press fit • requires machining• difficult to assemble• run-out and alignment issues • difficult to replace quickly
Counter-bore press fit • reduces stroke • requires machining• difficult to assemble• run-out and alignment issues • difficult to replace quickly
Coupling assembly • space demanding• reduces stroke • increases system inertia • requires radial support bearing • may reduce accuracy
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Application Examples
Where to Use Motorized Lead Screws Lead screws convert rotary motion into linear motion. Stepper motors and lead screws are complementary products. They operate within the same design specifications for speed, load and life. A typical method to marry these products into an application is by using external bearing supports and a drive coupling. Although this is acceptable, it is not the most economical approach, requires more components and a larger footprint. The ideal solution is to directly couple the screw and motor, eliminating the external supports and coupling.
Rotating Screw ApplicationsA rotating screw Motorized Lead Screw is ideal for applications that require precise linear motion and have dedicated external supports such as linear bearings or profile rails. Examples are: • Medical devices • X-Y stages • 3D printers
Rotating Nut ApplicationsA rotating nut Motorized Lead Screw is ideal for applications that require precise linear motion and also have integrated anti-rotation. Examples includes: • Fluid/syringe pumps • HVAC control valves • Pipetting devices • CNCs
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Application Examples
These common applications show that the Motorized Lead Screw will not only reduce the total number of components but also will reduce the overall footprint and make assembly and maintenance quicker and easier.
3D PrintingInnovative multi-axis printers are revolutionizing rapid prototyping and consumer products. A printer equipped with the Motorized Lead Screw can achieve key design advantages as outlined in the table below. Elimination of supports and couplings improves the print volume while reducing the component count and system cost.
Generic vs. Thomson
Generic Thomson
Z-Axis Stroke [in (mm)] 9.6 (244) 11.4 (289)
XY-Stroke [in (mm)] 8.7 × 14.2 (220 × 360) 10.6 × 16.8 (270 × 427)
Number of Unique Linear Motion Components 28 16
Interchangeable Lead Screws Yes Yes
Self-Aligning Assembly No Yes
External Support Bearing Required Yes No
Generic design
Thomson Motorized Lead Screw design!
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Application Examples
Fluid PumpSyringe pumps represent a significant segment of the medical industry and the design requirements depend upon high torque density and efficiency. Regardless of the mounting configuration, a Motorized Lead Screw can increase pump pressure, reduce equipment footprint, and more accurately disperse fluid.
Medical ScannerWhen it comes to planar motion, a Motorized Lead Screw can outperform the competition by delivering more thrust, more stroke, and lead screw interchangeability – making it the easiest to maintain Motorized Lead Screw on the market.
Other Applications The Motorized Lead Screw provides higher performance in a smaller and less complicated package. Designed for simple transport or critical applications, a Motorized Lead Screw solution eliminates redundant components, increases stroke length, provides greater axial force, and reduces power consumption. Other applications include:
• X-Y stages • HVAC control valves • CNCs • Pipetting • Robotics • Packaging • Scanning • Lens focusing • Plumbing • Laser cutting
Rotating Screw (configuration S)
Rotating Nut (configuration N)
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Inch Lead ScrewsLinear travel / full step [in] Lead [in] Type and screw diameter [in]
ML11 ML14 ML17 ML23
0.188 0.250 0.250 0.313 0.375
0.00015625 0.0313 • •
0.00025000 0.0500 •
0.00031250 0.0625 • • •
0.00041670 0.0833 •
0.00050000 0.1000 • •
0.00062500 0.1250 • •
0.00083300 0.1666 • •
0.00100000 0.2000 •
0.00125000 0.2500 • • • •
0.00200000 0.4000 •
0.00250000 0.5000 • • • •
0.00375000 0.7500 • •
0.00500000 1.0000 • •
Metric Lead ScrewsLinear travel / full step [mm] Lead [mm] Type and screw diameter [mm]
ML11 ML14 ML17 ML23
4 6 6 8 10
0.005 1.00 • • •
0.010 2.00 • •
0.015 3.00 •
0.020 4.00 • •
0.025 5.00 •
0.030 6.00 • •
0.040 8.00 • •
0.050 10.00 •
0.060 12.00 • • •
0.100 20.00 • •
Note: Other sizes and leads available – please contact Thomson for more information about custom lead screw availability.
Lead Screw Sizes
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(1) Contact Thomson for optional lead screw coatings.(2) Depending on lead.(3) Max. axial load based on a L10 life of 10000 hours of continuous motion at speeds of 100 to 300 RPM.
Basic SpecificationsLead Screw Material 303 Stainless Steel
Standard Coating (1) None
Standard Lead Accuracy [in/ft (µm/300 mm)] 0.010 (250)
Precision Lead Accuracy [in/ft (µm/300 mm)] 0.003 (75)
Straightness [in/ft (µm/300 mm)] 0.005 (125)
Lead NutStandard Material Internally lubricated acetal
High Performance Material Internally lubricated engineered thermoplastic
Nut Efficiency (2) [%) 35 to 85
Typical Linear Travel Life [in (km)] 10 × 10 6 (250)
MotorFrame Size NEMA 11 NEMA 14 NEMA 17 NEMA 23
Step Size [°] 1.8 1.8 1.8 1.8
Max. Axial Load (3) [lbs (N)] 20 (89) 50 (222) 75 (334) 200 (890)
Max. Radial Play [in @ lbs (mm @ N)] 0.001 @ 1 (0.03 @ 4)
End Play [in @ lbs (mm @ N)] 0.002 @ 2 (0.05 @ 9)
Concentricity of Mounting Pilot to Shaft [in (mm)] 0.003 (0.08) TIR
Perpendicularity of Shaft to Mounting Face [in (mm)] 0.003 (0.08) TIR
Max. Case Temperature [ °F (°C)] 140 (60) 176 (80)
Storage Temperature [ °F (°C)] -4 to 122 (-20 to 50)
Max. Humidity (non-condensing) [%] 85
Magnet Wire Insulation Class B 130 °C (266 °F)
Insulation Resistance 100 Mohm @ 500 VDC
Dielectric Strength 500 VAC for 1 minute
AssemblyMax. Backlash with Standard Nut [in (mm)] 0.010 (0.25)
Max. Backlash with XC Anti-Backlash Nut [in (mm)] 0 (0)
Runout [in/ft (µm/300 mm)] 0.007 (175)
Operating Temperature [ °F (°C)] 15 to 125 (- 10 to 50)
Specifications
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Lead Screw End Machining
* These are just some examples of non standard end-machining alternatives that are available. Please contact Thomson for more information.
Inch Lead Screw End Machining Dimensions
Screw Diameter
[in]
Screw Lead [in]
Recommended Bearing Dimensions [in]
OD[mm]
ID[mm]
W[mm]
Bearing Trade No.
ØD L1 L2 F G ØH L3 THD
0.188 all 7 2.5 2.5 692X 0.098 0.098 0.157 0.022 0.120 0.075 0.250 #4-40
0.250 all 13 4 5 624 0.157 0.197 0.256 0.020 0.217 0.150 0.250 #8-32
0.313 all 16 5 5 625 0.197 0.197 0.276 0.028 0.224 0.189 0.375 #10-24
0.375 all 19 6 6 626 0.236 0.236 0.315 0.030 0.266 0.220 0.500 1/4-20
Metric Lead Screw End Machining Dimensions
Screw Diameter
[mm]
Screw Lead [mm]
Recommended Bearing Dimensions [mm]
OD[mm]
ID[mm]
W[mm]
Bearing Trade No.
ØD L1 L2 F G ØH L3 THD
4 all 7 2.5 2.5 692X 2.50 2.50 4.00 0.56 3.05 1.91 6.35 M3X0.5
6 all 13 4 5 624 4.00 5.00 6.50 0.51 5.51 3.81 6.35 M4X0.7
8 all 16 5 5 625 5.00 5.00 7.00 0.70 5.70 4.80 9.53 M5X0.8
10 all 19 6 6 626 6.00 6.00 8.00 0.76 6.76 5.59 12.70 M6X1.0
Standard For Rotating Screw (S) Configurations Standard For Rotating Nut (N) Configurations
Non Standard End Machining Alternative* Non Standard End Machining Alternative*
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Ordering Key
Ordering Key
1 2 3 4 5 6 7 8
ML 23A155 S M08-02 -23000 S FSS -001
1. Product typeML = motorized lead screw
2. Motor code (1)
xxxyyy = see Motor Options tables 3. Configuration N = rotating nutS = rotating screw
4. Lead screw code (2) xyy-zzzz = see Lead Screw Options tables
5. Lead screw length (Ls)-xxxxx = xx.xxx inch (for inch lead screw units only)-xxxxx = xxx.xx mm (for metric lead screw units only)
6. Lead screw accuracyS = standardP = precision
7. Nut configuration code (3) XXX = rotating nut configuration default FSS = rotating screw configuration with standard flanged nutFSH = rotating screw configuration with standard flanged nut in high performance materialFAS = rotating screw configuration with standard flanged anti-backlash nut TAS = rotating screw configuration with standard threaded anti-backlash nut
8. Custom design code (issued by Thomson)-001 = default (standard design)
(1) The exact motor codes are found in the Motor Options tables on the product pages.The code consist of two parts (xxxyyy) where “xxx” describes frame size and stack number, and “yyy” the current draw of the motor. (2) The exact lead screw codes are found in the Lead Screw Options tables on the product pages. The code consist of three parts (xyy-zzzz) where “x” describes if the lead screw is inch (no letter) or metric (letter M), “yy” the diameter and “zzzz” the lead of the screw.
(3) Rotating nut configurations must always have code “XXX” in this position while rotating screw configurations must have one of the other codes. For custom threaded nut dimensions contact Thomson.
Example 1: ML11A051 S 18-0100-04000S FSS-001ML11A051 S: NEMA 11 motor, single stack, 0.51 A, rotating screw.18-0100-04000S: Lead screw with a 0.1875 inch diameter, 0.100 inch lead, 4 inch length and standard accuracy.FSS: Flanged nut, standard backlash, standard performance material. -001: Default Motorized Lead Screw configuration.
Example 2:ML17B150 N M06-12-20000S XXX-001ML17B150 N: NEMA 17 motor, double stack, 1.50 A, rotating nut.M06-12-20000S: Lead screw with a 6 mm diameter, 12 mm lead, 200 mm length and standard accuracy.XXX: Default nut sequence for rotating nut.-001: Default Motorized Lead Screw configuration.
Note: Please visit thomsonlinear.com/mls to access our online Motorized Lead Screw selector and part number generator.
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Specifications – ML11
Note: Other diameters and leads available – please contact Thomson for more information about custom lead screw availability.
* Applied voltage can be any value above this number as long as the driver output current is controlled at the rated RMS current.
Size 11A motor (single stack type) withrotating screw
Features and Benefits • Higher torque density than the competition. • NEMA 11 motor (size 28 mm). • Rotating screw version only.• Choose between a variety of inch and metric lead screws.
Motor OptionsMotor code Holding torque Voltage
/ phase*[V]
Current / phase
[A]
Resistance [Ω]
Inductance [mH]
Powerdraw [W]
Stepangle[ ° ]
Motor length, maximum (Lm)
Rotor inertia [oz-in2]
Motor weight
[lbs][oz-in] [N-m] [in] [mm]
11A051 9.3 0.066 3.85 0.51 7.54 5.22 1.96 1.8 1.26 32.0 0.06 0.24
11A100 10.1 0.071 2.19 1.00 2.19 1.53 2.19 1.8 1.26 32.0 0.06 0.24
Metric Lead Screw OptionsScrew code Diameter [mm] Lead [mm] Travel / step [mm]
M04-01
4
1 0.00500
M04-04 4 0.02000
M04-08 8 0.04000
Inch Lead Screw OptionsScrew code Diameter [in] Lead [in] Travel / step [in]
18-0050
0.188
0.050 0.00025
18-0100 0.100 0.00050
18-0200 0.200 0.00100
18-0400 0.400 0.00200
• Recommended max. thrust force 20 lbs (89 N). • Recommended max. lead screw length of 4 in (102 mm) for optimal performance. Longer length lead screws available, see diagrams on page 24.
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Dimensions – ML11
Standard nut (FSS) (B)
(A) 6-pin connector as standard (X1 = pin 1, X6 = pin 6). Custom connection solutions possible. Contact Thomson for more information.(B) For dimensions and data on anti-backlash nut, please contact Thomson for more information.
* Molex connector p/n 53253-0670. Mates with Molex connector p/n 51065-0600.
ML11xxxxxxS (rotating screw)
Motor Connection
Motor Connector Kit with Flying Leads - Optional• Compatible with the above motor connector. • Lead length 12.5 in (318 mm).• 26 AWG lead wires.• Part number MC11-001.• Contact Thomson for more information.
Maximum Stroke (Smax)
Smax = Ls - Ln - 0.08 in (2 mm)
Dimensions Projection
Inch [mm]
(A)
Molex connector p/n 51065-0600. Lead color (pin no.) green (6)
black (4) red (3)
blue (1)
Molex Connector *
Pin Phase
1 A-
2 not used
3 A+
4 B-
5 not used
6 B+
Phase A
B+
B-
A+
A-Phase B
4
6
1
3
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Specifications – ML14
Size 14A motor (single stack type) withrotating screw
Features and Benefits • Higher torque density than the competition.• NEMA 14 motor (size 35 mm). • Rotating screw versions only.• Choose between a variety of inch and metric lead screws.
Motor OptionsMotor code Holding torque Voltage
/ phase*[V]
Current / phase
[A]
Resistance [Ω]
Inductance [mH]
Powerdraw [W]
Stepangle[ ° ]
Motor length, maximum (Lm)
Rotor inertia [oz-in2]
Motor weight
[lbs][oz-in] [N-m] [in] [mm]
14A088 25.8 0.182 3.42 0.88 3.89 5.51 3.01 1.8 1.34 34.0 0.10 0.41
14A135 23.0 0.162 1.71 1.35 1.27 1.79 2.31 1.8 1.34 34.0 0.10 0.41
Metric Lead Screw OptionsScrew code Diameter [mm] Lead [mm] Travel / step [mm]
M06-01
6
1 0.00500
M06-06 6 0.03000
M06-12 12 0.06000
Inch Lead Screw OptionsScrew code Diameter [in] Lead [in] Travel / step [in]
25-0031
0.250
0.0313 0.00016
25-0063 0.0625 0.00031
25-0125 0.1250 0.00063
25-0250 0.2500 0.00125
25-0500 0.5000 0.00250
25-0750 0.7500 0.00375
• Recommended max. thrust force 50 lbs (222 N). • Recommended max. lead screw length of 8 in (203 mm) for optimal performance. Longer length lead screws available, see diagrams on page 24.
* Applied voltage can be any value above this number as long as the driver output current is controlled at the rated RMS current.
Note: Other diameters and leads available – please contact Thomson for more information about custom lead screw availability.
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Dimensions – ML14
Anti-backlash nut (FAS) Standard nut (FSS)
ML14xxxxxxS (rotating screw)
Maximum Stroke (Smax)
Smax = Ls - Ln - 0.08 in (2 mm)
Dimensions Projection
Inch [mm]
(A) Flying leads are standard. Custom connection solutions possible. Contact Thomson for more information.
*Table valid for ML14, ML17 and ML23 motors.
(A)
Motor Connection*
Flying Leads
Lead color Phase
Red A+
Blue A-
Green B+
Black B-
Phase A
A+
A-
B+
B-Phase B
Blue
Red
Black
Green
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Specifications – ML17
Size 17A motor (single stack type) with rotating nut
Size 17B (double stack type) withrotating nut
Size 17A motor (single stack type) withrotating screw
Size 17B (double stack type) withrotating screw
Features and Benefits • Higher torque density than the competition.• NEMA 17 motor (size 42 mm). • Rotating screw and rotating nut versions available.• Choose between a variety of inch and metric lead screws.
Motor OptionsMotor code Holding torque Voltage
/ phase*[V]
Current / phase
[A]
Resistance [Ω]
Inductance [mH]
Powerdraw [W]
Stepangle[ ° ]
Motor length, maximum (Lm)
Rotor inertia [oz-in2]
Motor weight
[lbs][oz-in] [N-m] [in] [mm]
17A100 77.0 0.544 2.33 1.00 2.33 5.61 2.33 1.8 1.34 34.0 0.23 0.4
17A150 92.0 0.650 1.76 1.50 1.17 3.26 2.63 1.8 1.34 34.0 0.23 0.4
17B100 107.8 0.761 1.69 1.00 1.69 5.66 1.69 1.8 1.89 48.0 0.47 0.7
17B150 102.8 0.726 1.31 1.50 0.87 2.7 1.96 1.8 1.89 48.0 0.47 0.7
Metric Lead Screw OptionsScrew code Diameter [mm] Lead [mm] Travel / step [mm]
M06-01
6
1 0.00500
M06-06 6 0.03000
M06-12 12 0.06000
Inch Lead Screw OptionsScrew code Diameter [in] Lead [in] Travel / step [in]
25-0031
0.250
0.0313 0.00016
25-0063 0.0625 0.00031
25-0125 0.1250 0.00063
25-0250 0.2500 0.00125
25-0500 0.5000 0.00250
25-0750 0.7500 0.00375
• Recommended max. thrust force 75 lbs (334 N). • Recommended max. lead screw length of 8 in (203 mm) for optimal performance. Longer length lead screws available, see diagrams on page 24.
* Applied voltage can be any value above this number as long as the driver output current is controlled at the rated RMS current.
Note: Other diameters and leads available – please contact Thomson for more information about custom lead screw availability.
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Dimensions – ML17
ML17xxxxxxN (rotating nut)
ML17xxxxxxS (rotating screw)
Anti-backlash nut (FAS) Standard nut (FSS)
Dimensions Projection
Inch [mm]
Maximum Stroke (Smax)
Smax = Ls - Lm - 0.08 in (2 mm)
Maximum Stroke (Smax)
Smax = Ls - Ln - 0.08 in (2 mm)
Dimensions Projection
Inch [mm]
(A) Flying leads are standard. Custom connection solutions possible. Contact Thomson for more information.
Motor connection information! See table on page 15.
Motor connection information! See table on page 15.
(A)
(A) Flying leads are standard. Custom connection solutions possible. Contact Thomson for more information.
(A)
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ML23 – Specifications
Motor OptionsMotor code Holding torque Voltage
/ phase*[V]
Current / phase
[A]
Resistance [Ω]
Inductance [mH]
Powerdraw [W]
Stepangle[ ° ]
Motor length, maximum (Lm)
Rotor inertia [oz-in2]
Motor weight
[lbs][oz-in] [N-m] [in] [mm]
23A155 121.0 0.854 3.77 1.55 2.43 4.20 5.84 1.8 1.78 45.2 1.04 1.13
23A300 123.8 0.875 1.74 3.00 0.58 1.16 5.22 1.8 1.78 45.2 1.04 1.13
23B190 251.2 1.774 3.80 1.90 2.00 5.84 7.22 1.8 2.59 65.8 2.13 1.70
23B390 260.8 1.842 1.99 3.90 0.51 1.45 7.76 1.8 2.59 65.8 2.13 1.70
Metric Lead Screw OptionsScrew code Diameter [mm] Lead [mm] Travel / step [mm]
M08-02
8
2 0.01000
M08-04 4 0.02000
M08-08 8 0.04000
M08-12 12 0.06000
M08-20 20 0.10000
M10-02
10
2 0.01000
M10-03 3 0.01500
M10-05 5 0.02500
M10-10 10 0.05000
M10-20 20 0.10000
Inch Lead Screw OptionsScrew code Diameter [in] Lead [in] Travel / step [in]
31-0083
0.313
0.083 0.00042
31-0167 0.167 0.00083
31-0250 0.250 0.00125
31-0500 0.500 0.00250
31-1000 1.000 0.00500
37-0063
0.375
0.063 0.00031
37-0100 0.100 0.00050
37-0167 0.167 0.00083
37-0250 0.250 0.00125
37-0500 0.500 0.00250
37-1000 1.000 0.00500
Size 23A motor (single stack type) with rotating nut
Size 23B (double stack type) withrotating nut
Size 23A motor (single stack type) withrotating screw
Size 23B (double stack type) withrotating screw
Features and Benefits • Higher torque density than the competition.• NEMA 23 motor (size 57 mm). • Rotating screw and rotating nut versions available.• Choose between a variety of inch and metric lead screws.
• Recommended max. thrust force 200 lbs (890 N). • Recommended max. lead screw length of 12 in (305 mm) for diameter 0.313 in and 8 mm, and 16 in (406 mm) for diameter 0.375 in and 10 mm for optimal performance. Longer length lead screws available, see diagrams on page 24.
* Applied voltage can be any value above this number as long as the driver output current is controlled at the rated RMS current.
Note: Other diameters and leads available – please contact Thomson for more information about custom lead screw availability.
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ML23 – Dimensions
ML23xxxxxxN (rotating nut)
ML23xxxxxxS (rotating screw)
Anti-backlash nut (FAS) Standard nut (FSS)
Dimensions Projection
Inch [mm]
Maximum Stroke (Smax)
Smax = Ls - Lm - 0.06 in (1.6 mm)
Maximum Stroke (Smax)
Smax = Ls - Ln - 0.06 in (1.6 mm)
Dimensions Projection
Inch [mm]
(A) Flying leads are standard. Custom connection solutions possible. Contact Thomson for more information.
(A)
(A) Flying leads are standard. Custom connection solutions possible. Contact Thomson for more information.
(A)
Motor connection information! See table on page 15.
Motor connection information! See table on page 15.
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ML11, ML14 – Performance Diagrams ML11A100
ML14A088
Linear Speed vs. Force
Linear Speed vs. Force
Lead Screw Code
Lead Screw Code
25-075025-050025-0250
18-040018-0200
25-012525-006325-0031
18-010018-0050
Load area not recommended
Note! All motor load curves were generated with a 40 VDC, 2-phase ON driver and full stepped at the motor rated current. Performance plots for other lead screw and motor winding configurations can be generated at thomsonlinear.com/mls.
Load area not recommended
Forc
e [lb
s]Fo
rce
[lbs]
Forc
e [lb
s]Fo
rce
[lbs]
Forc
e [N
]Fo
rce
[N]
Forc
e [N
]Fo
rce
[N]
Motor Speed [RPM]
Motor Speed [RPM]
Linear Speed [in/s (mm/s)]
Linear Speed [in/s (mm/s)]
Motor Speed vs. Force
Motor Speed vs. Force
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ML17 – Performance Diagrams ML17A150
ML17B150
Linear Speed vs. Force
Linear Speed vs. Force
25-075025-050025-0250
Lead Screw Code
Lead Screw Code25-075025-050025-0250
25-012525-006325-0031
25-012525-006325-0031
Load area not recommended
Load area not recommended
Forc
e [lb
s]
Forc
e [lb
s]
Forc
e [N
]
Forc
e [N
]
Motor Speed [RPM]
Motor Speed [RPM]
Linear Speed [in/s (mm/s)]
Linear Speed [in/s (mm/s)]
Motor Speed vs. Force
Motor Speed vs. Force
Note! All motor load curves were generated with a 40 VDC, 2-phase ON driver and full stepped at the motor rated current. Performance plots for other lead screw and motor winding configurations can be generated at thomsonlinear.com/mls.
Linear Speed vs. Force
Forc
e [lb
s]
Forc
e [lb
s]
Forc
e [N
]
Forc
e [N
]
Motor Speed vs. Force
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Linear Speed vs. Force
Linear Speed vs. Force
ML23A300
ML23B300
ML23 – Performance Diagrams
37-100037-050037-0250
37-100037-050037-0250
37-016737-010037-0063
37-016737-010037-0063
Load area not recommended
Load area not recommended
Forc
e [lb
s]Fo
rce
[lbs]
Forc
e [lb
s]Fo
rce
[lbs]
Forc
e [N
]Fo
rce
[N]
Forc
e [N
]Fo
rce
[N]
Motor Speed [RPM]
Motor Speed [RPM] Linear Speed [in/s (mm/s)]
Linear Speed [in/s (mm/s)]
Motor Speed vs. Force
Motor Speed vs. Force
Lead Screw Code
Lead Screw Code
Note! All motor load curves were generated with a 40 VDC, 2-phase ON driver and full stepped at the motor rated current. Performance plots for other lead screw and motor winding configurations can be generated at thomsonlinear.com/mls.
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Motorized Lead Screws
www.thomsonlinear.com/mls
*Performance curve upper limits should be avoided for critical and/or high duty cycle applications. Generally a safety factor of 2 is recommended when sizing an application.
How to Select Motor and Lead ScrewFor a basic sizing determination, use performance charts to find appropriate screw lead and diameter for desired motor size. Use linear travel speed and dynamic load.
Example:Speed = 2 in/sLoad = 30 lbs
Given the speed and load requirements of 2 in/s and 30 lbs, respectively, a ML17A150 motor with an inch lead screw with a diameter and lead of 0.25 inch (25-0250) will be a sufficient Motorized Lead Screw assembly for this application*.
Please visit www.thomsonlinear.com/mls for a more detailed sizing calculator or call Thomson to speak with a Motorized Lead Screw sizing specialist.
Sizing and Selection Guidelines
ML17A150 Linear Speed vs. Force
Lead Screw Code
Load area not recommended
Forc
e [lb
s]
Forc
e [N
]Linear Speed [in/s (mm/s)]
25-075025-050025-0250
25-012525-006325-0031
30 lbs
2 in/s
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Sizing and Selection Guidelines
How to Determine Maximum Permissible Screw LengthIn order to determine the maximum possible lead screw length for your Motorized Lead Screw assembly, the following charts can be used. These charts take in to consideration the maximum rotational speed and compression load as well as the end fixity of your system.
1. Determine Maximum Motor SpeedCalculate what the maximum motor speed will be for your specific application.
2. Decide Type of Screw End FixityThere are four basic types of end fixity (A, B, C and D). The maximum screw length (Ls) for a given motor speed, unit size and screw diameter will vary depending on the selection.
3. Check Critical Screw Speed Check Critical Speed diagram for your maximum speed, lead screw diameter and end fixity to determine the maximum permissible screw length for your application. For rotating screw configurations (S), the Taper-Lock connection within the motor can be considered fixed.
4. Check Column LoadingAnother limiting factor for the screw length is how much column loading (buckling) the screw is subjected to. Check the Column Load diagram to see that your load and desired maximum screw length are compatible with regards to the unit size, lead screw diameter and end fixity being used.
Spee
d [R
PM]
Forc
e [lb
s]
Forc
e [N
]
Max. Screw Length (Ls) [in (mm)]
Type of Screw End Fixity
Fixed / Free Simple / Simple Fixed / Simple Fixed / Fixed
Max. Screw Length (Ls) [in (mm)]
Unit Size and Lead Screw Diameter Combination
ML140.250 in6 mm
ML170.250 in6 mm
ML230.375 in10 mm
ML11 0.188 in4 mm
ML14ML17 0.250 in6 mm
ML23 0.313 in8 mm
ML23 0.375 in10 mm
Critical Speed Motor Speed vs. Maximum Screw Length
Column Load Compression Force vs. Maximum Screw Length
25
Motorized Lead Screws
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1. Select Motorized Lead Screw Configuration Determine which of the two types of configurations – rotating
screw (S) or rotating nut (N) – the application requires. See page 3 and 5 for more information.
2. Select Motor Size Select the appropriate size based on desired performance, motor
frame size, etc. Thomson offers four base models (ML11, ML14, ML17 and ML23) with optional motor windings, linear travel and load capacity selection.
3. Select Lead Screw Select the lead screw diameter and length with regard to the
required stroke of the application and the type of end machining the screw requires.
4. Select Nut For rotating screw (S) configurations, choose between various
nut mounting styles, materials, and backlash options. Rotating nut (N) configurations as default always come in a high performance material, standard backlash nut.
5. Mount the Motorized Lead Screw Mount the unit into the application using the tolerance
guidelines shown on page 9.
Installation Guidelines
Installation The successful integration of a Motorized Lead Screw in an application is primarily dependent on the screw alignment and subsequent screw runout. If incorrectly mounted, a lead screw assembly will have significantly reduced system life and may be noisy or inaccurate. Thomson methodically straightens all screws prior to assembly to minimize vibration and runout. The Taper-Lock coupling method also was designed to provide a concentric interface and optimize alignment. Proper alignment, end support configuration and lead nut selection are important factors to achieve a well designed installation that will exceed expectations.
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Rotating Screw Lead Screw SwappingThe unique Taper-Lock coupling allows for quick andeasy assembly and disassembly. This means that one can easily try out different lead screw motor combinations in an application. This capability to swap out lead screws and motors enables the end user to rapidly prototype, validate designs, replace damaged parts or simply upgrade to higher performance components – all with a simple hex wrench.
Lead Screw Removal - OptionalDue to the secure connection of the Taper-Lock coupling, an additional feature may be added to facilitate the removal of the lead screw. Remove the fastener securing the lead screw and use the oversize removal screw to gently push the lead screw out. Removal screw thread sizes are shown in the table below.*
Quick and easy comissioning, service and maintenance are some key points to a successfull installation. The Motorized Lead Screw will enable just that while keeping spare parts stock and tools required to a minimum.
Comissioning, Service and Maintenance Advantages
*Removal thread does not come standard in Motorized Lead Screw assemblies – contact Thomson if internal shaft thread is required.
Taper-Lock Removal Thread SpecificationsMotor code Lead scew code Fastener screw
sizeRecommended fastener
screw length [mm]Recommended fastener screw
torque [lbs-in (Nm)]Removal screw
size
ML11AxxxS18-xxxx
M2.5×0.45 18 11 (1.2) M3×0.5M04-xx
ML14AxxxS25-xxxx
M3×0.5 22 20 (2.3) M4×0.7M06-xx
ML17AxxxS25-xxxx
M3×0.5 14 20 (2.3) M4×0.7M06-xx
ML17BxxxS25-xxxx
M3×0.5 22 20 (2.3) M4×0.7M06-xx
ML23AxxxS31-xxxx
M4×0.7 18 45 (5.1) M5×0.8M08-xx
ML23BxxxS31-xxxx
M4×0.7 35 45 (5.1) M5×0.8M08-xx
ML23AxxxS37-xxxx
M5×0.8 25 90 (10.2) M6×1.0M10-xx
ML23BxxxS37-xxxx
M5×0.8 45 90 (10.2) M6×1.0M10-xx
27
Motorized Lead Screws
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Glossary
Accuracy A measurement of precision. Perfect accuracy, for example, means advancing a lead nut linearly one inch from any point on a screw will always require the exact same number of revolutions.
Axial Load A load passing through the center axis of the lead screw.
Backdrive Application of a force on a lead nut to cause rotation of the screw; in essence, converting linear to rotary motion.
Backlash The axial or radial free motion between the lead nut and lead screw; a measure of system stiffness and repeatability.
Bipolar Motor Motor with two phases and a single winding per phase (4 lead wires). All Thomson standard stepper motors are bipolar.
Chopper Drive A constant current stepper motor drive that operates by quickly cycling power on and off, or “chopping.“
Column Load Column loading is the compression load on the screw. This load has a tendency to buckle the screw and is dependent on screw diameter, screw length and type of mounting.
Concentricity Condition where the median points of two or more radially-disposed features are congruent with the axis (or center point).
Critical Speed The condition where the rotary speed of the assembly sets up harmonic vibrations. These vibrations are the result of shaft diameter, unsupported length, type of bearing support, lead nut mounting method and/or screw rpm. Vibrations may also be caused by a bent screw or faulty installation alignment.
Drag Torque The amount of torque required to drive the unloaded lead screw.
Driving Torque The amount of effort required to turn the lead screw and move the load.
Dynamic Load Load applied to Motorized Lead Screw assembly while in motion.
Efficiency (Lead Screw) Expressed as a percentage, the ability of a lead screw assembly to convert torque to thrust with minimal mechanical loss. Thomson lead screws range in efficiency from 35 to 85%.
Efficiency (Motor) Expressed as a percentage, the motor‘s ability to turn electrical energy into mechanical energy with minimal thermal loss. Thomson stepper motors range in efficiency from 65 to 90%.
End Fixity or End Bearing Support
How the ends of the lead screw are fixed or supported.
Holding Torque Torque required to rotate motor shaft while all coils are fully energized with a steady state DC current.
Inertia The level of rotational resistance of a lead screw or shaft.
Lead The axial distance a screw travels during one revolution. If thread is 1 start, lead = pitch.
Microstepping Dividing the motors natural full step by smaller increments. Example: 1.8 º step motor microstepped at 64× will mean that 1 pulse is now 1.8 º/64 = 0.028 º.
Perpendicularity Condition of a surface, center plane, or axis at a right angle to a plane or axis.
Pitch Distance measured between adjacent threads of the lead screw - if thread is 1 start, then pitch = lead.
Pulse Rate The number of pulses per second (pps) applied to the windings of the motor. 1 pulse = 1 step.
Repeatability A measure of constancy that is directly related to axial backlash. Higher backlash equates to lower repeatability and may be corrected by preloading the lead nut if required.
Resolution The linear distance the Motorized Lead Screw will actuate the lead nut or screw per input pulse.
Resonance Vibration occurring when a mechanical system operates within an unstable range.
Runout Composite tolerance used to control the functional relationship of one or more features of a part to an axis.
Side Load (Radial) A load applied perpendicular to the lead screw axis. Not recommended for lead screw applications as it will reduce functional life.
Static Load Static load is the maximum non-operating load capacity above which failure of the motor and/or lead nut occurs.
Straightness Condition where an element of a surface, or an axis, is in a straight line.
Stroke The maximum length of extension of a lead nut on the lead screw.
Thrust Force or Thrust Load
Thrust load is loading parallel to and concentric with the centerline of the screw which acts continuously in one direction. Thrust loading is the proper method of attaching the load to the lead screw assembly.
Travel/Step or Travel Rate
The linear translation of a lead nut or screw for one full step of the motor.
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Motorized_Lead_Screw_BREN-0012-04A | 20150401TJSpecifications are subject to change without notice. It is the responsibility of the product user to determine the suitability of this product for a specific application. All trademarks property of their respective owners. © Thomson Industries, Inc. 2015
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